John Guest Speedfit Black Union Couplers (Straight Union Connectors) are designed for the connection of plastic and copper pipes. Simply push the fitting fully onto the pipe and twist the plastic nut clockwise to lock in place. For disconnection unlock the nut and push the collet towards the body of the fitting and pull the pipe to release. Using JG Speedfit connectors can reduce installation time by around 40% against traditional fixing methods. The JG Fittings are designed, manufactured and assembled in the UK. The JG Black Couplers are manufactured from high quality engineered plastic with EPDM O-rings and are available in 3/4” and 1” size.